(named after Thomas Jefferson) Family, Barberry. Sepals, 4. Petals and stamens, 8. Pod, with many seeds, opening by a horizontal slit. Flower, one inch across, single, on a naked scape, 6 to 8 inches high. Leaves, all from the root, long-petioled, divided into 2 ovate leaflets. April and May.

A plant of low growth, with fibrous roots, perennial, not uncommon in the open woods of western New York, southward and westward.